KELVIR.B -- New Messenger worm is MEDIUM RISK
Secunia has just declared MEDIUM RISK on Kelvir.B and Symantec also shows a high prevelance of this worm. The Spybot version dropped as a part of a "two-in-one" virus is more damaging than the Kelvir worm in an unpatched corporate network. 
KELVIR.B -- MSN Messenger worm MEDIUM RISK http://secunia.com/virus_information/16006/ Other AV Vendors may use
http://secunia.com/virus_information/15994/ http://secunia.com/virus_information/16014/ W32.Kelvir.B is a worm that spreads through Windows Messenger and MSN Messenger and attempts to download and execute a variant of W32.Spybot.Worm.